#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a=0, b=0, c=0;
	while (scanf("%d%d%d", &a, &b, &c) != EOF)
	{
		if (a + b > c && a + c > b && b + c > a)
		{
			
			if (a == b || b == c || c == a)
			{
				printf("Isosceles triangle!"); 
			}
			else if (a == b && b == c)
			{
				printf("Equilateral triangle!");
			}
			else
			{
				printf("Ordinary triangle!");
			}
		}
		else
		{
			printf("Not a triangle!");
		}
	}
	
	return 0;
}
